diff options
| -rw-r--r-- | drivers/base/core.c | 9 | ||||
| -rw-r--r-- | fs/sysfs/dir.c | 37 | ||||
| -rw-r--r-- | fs/sysfs/symlink.c | 41 | ||||
| -rw-r--r-- | fs/sysfs/sysfs.h | 1 | ||||
| -rw-r--r-- | include/linux/sysfs.h | 10 |
5 files changed, 84 insertions, 14 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index c05b1159023e..7d5c63c81a59 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1345,8 +1345,9 @@ int device_rename(struct device *dev, char *new_name) if (old_class_name) { new_class_name = make_class_name(dev->class->name, &dev->kobj); if (new_class_name) { - error = sysfs_create_link(&dev->parent->kobj, - &dev->kobj, new_class_name); + error = sysfs_create_link_nowarn(&dev->parent->kobj, + &dev->kobj, + new_class_name); if (error) goto out; sysfs_remove_link(&dev->parent->kobj, old_class_name); @@ -1354,8 +1355,8 @@ int device_rename(struct device *dev, char *new_name) } #else if (dev->class) { - error = sysfs_create_link(&dev->class->p->class_subsys.kobj, - &dev->kobj, dev->bus_id); + error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, + &dev->kobj, dev->bus_id); if (error) goto out; sysfs_remove_link(&dev->class->p->class_subsys.kobj, diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 8c0e4b92574f..c1a7efb310bf 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -398,7 +398,7 @@ void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, } /** - * sysfs_add_one - add sysfs_dirent to parent + * __sysfs_add_one - add sysfs_dirent to parent without warning * @acxt: addrm context to use * @sd: sysfs_dirent to be added * @@ -417,7 +417,7 @@ void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, * 0 on success, -EEXIST if entry with the given name already * exists. */ -int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) +int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) { if (sysfs_find_dirent(acxt->parent_sd, sd->s_name)) return -EEXIST; @@ -435,6 +435,39 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) } /** + * sysfs_add_one - add sysfs_dirent to parent + * @acxt: addrm context to use + * @sd: sysfs_dirent to be added + * + * Get @acxt->parent_sd and set sd->s_parent to it and increment + * nlink of parent inode if @sd is a directory and link into the + * children list of the parent. + * + * This function should be called between calls to + * sysfs_addrm_start() and sysfs_addrm_finish() and should be + * passed the same @acxt as passed to sysfs_addrm_start(). + * + * LOCKING: + * Determined by sysfs_addrm_start(). + * + * RETURNS: + * 0 on success, -EEXIST if entry with the given name already + * exists. + */ +int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) +{ + int ret; + + ret = __sysfs_add_one(acxt, sd); + if (ret == -EEXIST) { + printk(KERN_WARNING "sysfs: duplicate filename '%s' " + "can not be created\n", sd->s_name); + WARN_ON(1); + } + return ret; +} + +/** * sysfs_remove_one - remove sysfs_dirent from parent * @acxt: addrm context to use * @sd: sysfs_dirent to be removed diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c index 817f5966edca..a3ba217fbe74 100644 --- a/fs/sysfs/symlink.c +++ b/fs/sysfs/symlink.c @@ -19,13 +19,8 @@ #include "sysfs.h" -/** - * sysfs_create_link - create symlink between two objects. - * @kobj: object whose directory we're creating the link in. - * @target: object we're pointing to. - * @name: name of the symlink. - */ -int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name) +static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target, + const char *name, int warn) { struct sysfs_dirent *parent_sd = NULL; struct sysfs_dirent *target_sd = NULL; @@ -65,7 +60,10 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char target_sd = NULL; /* reference is now owned by the symlink */ sysfs_addrm_start(&acxt, parent_sd); - error = sysfs_add_one(&acxt, sd); + if (warn) + error = sysfs_add_one(&acxt, sd); + else + error = __sysfs_add_one(&acxt, sd); sysfs_addrm_finish(&acxt); if (error) @@ -80,6 +78,33 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char } /** + * sysfs_create_link - create symlink between two objects. + * @kobj: object whose directory we're creating the link in. + * @target: object we're pointing to. + * @name: name of the symlink. + */ +int sysfs_create_link(struct kobject *kobj, struct kobject *target, + const char *name) +{ + return sysfs_do_create_link(kobj, target, name, 1); +} + +/** + * sysfs_create_link_nowarn - create symlink between two objects. + * @kobj: object whose directory we're creating the link in. + * @target: object we're pointing to. + * @name: name of the symlink. + * + * This function does the same as sysf_create_link(), but it + * doesn't warn if the link already exists. + */ +int sysfs_create_link_nowarn(struct kobject *kobj, struct kobject *target, + const char *name) +{ + return sysfs_do_create_link(kobj, target, name, 0); +} + +/** * sysfs_remove_link - remove symlink in object's directory. * @kobj: object we're acting for. * @name: name of the symlink to remove. diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index ce4e15f8aaeb..a5db496f71c7 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -107,6 +107,7 @@ struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); void sysfs_put_active_two(struct sysfs_dirent *sd); void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *parent_sd); +int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 7858eac40aa7..37fa24152bd8 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -101,6 +101,9 @@ void sysfs_remove_bin_file(struct kobject *kobj, struct bin_attribute *attr); int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target, const char *name); +int __must_check sysfs_create_link_nowarn(struct kobject *kobj, + struct kobject *target, + const char *name); void sysfs_remove_link(struct kobject *kobj, const char *name); int __must_check sysfs_create_group(struct kobject *kobj, @@ -180,6 +183,13 @@ static inline int sysfs_create_link(struct kobject *kobj, return 0; } +static inline int sysfs_create_link_nowarn(struct kobject *kobj, + struct kobject *target, + const char *name) +{ + return 0; +} + static inline void sysfs_remove_link(struct kobject *kobj, const char *name) { } |